The 3 x 4 inch sterile nonwoven sponges protect against contamination. They feature a nonwoven exterior that forms a protective barrier around the wound to prevent against bacteria and airborne contaminants. The interior consists of a cellulose liner and rayon fill that's super absorbent, helping to draw moisture and fluids away from the injury. The cushioned nonwoven 8-ply dressings insulate wounds to prevent re-opening.